新做的板子，sdc2 4线连接 emmc，型号ZDEMMC04GA，PPRST 是系统复位脚，emmc rst直接上拉到3.3v也试过，都是不识别。
原理图：
sys_config.fex
[card2_boot_para]
card_ctrl = 2
card_high_speed = 1
card_line = 4
sdc_clk = port:PC02<3><1><3><default>
sdc_cmd = port:PC03<3><1><3><default>
sdc_d0 = port:PC06<3><1><3><default>
sdc_d1 = port:PC05<3><1><3><default>
sdc_d2 = port:PC04<3><1><3><default>
sdc_d3 = port:PC07<3><1><3><default>
;cap-mmc-highspeed =
sdc-frequency = 5000000
;sdc_boot = 2
;sdc_tm4_hs200_max_freq = 150
;sdc_tm4_hs400_max_freq = 100
;sdc_ex_dly_used = 2
sdc_io_1v8 = 0
sdc_tm4_win_th = 8
;sdc_dis_host_caps = 0x180
;sdc_erase = 2
sdc_boot0_sup_1v8 = 0
sdc_type = "tm4"
dts:
&sdc2 {
non-removable;
bus-width = <4>;
mmc-ddr-3_3v;
//mmc-ddr-1_8v;
//mmc-hs200-1_8v;
/*mmc-hs400-1_8v;*/
no-sdio;
no-sd;
ctl-spec-caps = <0x308>;
cap-mmc-highspeed;
sunxi-power-save-mode;
sunxi-dis-signal-vol-sw;
mmc-bootpart-noacc;
max-frequency = <50000000>;
//vmmc-supply = <®_3p3v>;
//vqmmc33sw-supply = <®_3p3v>;
/*max-frequency = <100000>;*/
/*vmmc-supply = <®_dcdc1>;*/
/*emmc io vol 3.3v*/
/*vqmmc-supply = <®_aldo1>;*/
/*emmc io vol 1.8v*/
/*vqmmc-supply = <®_eldo1>;*/
status = "okay";
};
用usb下载程序：
用SD卡能启动，log
[ 1.950569] sunxi-mmc 4022000.sdmmc: SD/MMC/SDIO Host Controller Driver(v4.21 2021-11-18 10:02)
[ 1.960511] sunxi-mmc 4022000.sdmmc: ***ctl-spec-caps*** 308
[ 1.966904] sunxi-mmc 4022000.sdmmc: No vmmc regulator found
[ 1.973225] sunxi-mmc 4022000.sdmmc: No vqmmc regulator found
[ 1.979628] sunxi-mmc 4022000.sdmmc: No vdmmc regulator found
[ 1.986057] sunxi-mmc 4022000.sdmmc: No vd33sw regulator found
[ 1.992572] sunxi-mmc 4022000.sdmmc: No vd18sw regulator found
[ 1.999073] sunxi-mmc 4022000.sdmmc: No vq33sw regulator found
[ 2.005584] sunxi-mmc 4022000.sdmmc: No vq18sw regulator found
[ 2.012111] sunxi-mmc 4022000.sdmmc: Cann't get pin bias hs pinstate,check if needed
[ 2.021460] sunxi-mmc 4022000.sdmmc: sdc set ios:clk 0Hz bm PP pm UP vdd 21 width 1 timing LEGACY(SDR12) dt B
[ 2.045107] sunxi-mmc 4022000.sdmmc: sdc set ios:clk 400000Hz bm PP pm ON vdd 21 width 1 timing LEGACY(SDR12) dt B
[ 2.069283] sunxi-mmc 4022000.sdmmc: detmode:alway in(non removable)
[ 2.076413] sunxi-mmc 4022000.sdmmc: sdc set ios:clk 400000Hz bm PP pm ON vdd 21 width 1 timing LEGACY(SDR12) dt B
[ 2.088880] sun8iw20-pinctrl 2000000.pinctrl: 2000000.pinctrl supply vcc-pfo not found, using dummy regulator
[ 2.090981] sunxi-mmc 4022000.sdmmc: sdc set ios:clk 400000Hz bm PP pm ON vdd 21 width 1 timing LEGACY(SDR12) dt B
[ 2.100142] sunxi-mmc 4020000.sdmmc: SD/MMC/SDIO Host Controller Driver(v4.21 2021-11-18 10:02)
[ 2.112857] sunxi-mmc 4022000.sdmmc: sdc set ios:clk 400000Hz bm OD pm ON vdd 21 width 1 timing LEGACY(SDR12) dt B
[ 2.121377] sunxi-mmc 4020000.sdmmc: ***ctl-spec-caps*** 8
[ 2.133640] sunxi-mmc 4022000.sdmmc: smc 0 p2 err, cmd 1, RTO !!
[ 2.139136] sunxi-mmc 4020000.sdmmc: No vqmmc regulator found
[ 2.145575] sunxi-mmc 4022000.sdmmc: retry:start